Drill



Patented Aug. 24, 1926.

UNITED STATES PATENT OFFICE.

GRANVILLE A. HUMASON, OF HOUSTON, TEXAS, ASSIGNOR OF THREE-FOURTHS TO O'IOKAR J'. DOUIBEK AND J. RAYMOND GOOKENBOO, BOTH OF HARRIS COUNTY,

TEXAS.

DRILL.

Application filed July 28, 1925. Serial No. 46,651.

This invention relates to new and useful imsrovements in a drill.

ne object of the invention is to provide g tions.

Another object of the invention resides in the provision of novel means for detachably anchoring the cutting rollers to the drill head. a

A further feature of the invention resides in the provision of a drill specially adapted to bore through rock or other hard formations, and equipped with means for taking 1 cores, or samples, of the strata being pierced. I

A still further feature of the invention resides in the provision of a drill of the character described equipped with a novel type of cutting, or abrading roller.-

With the above and other objects in view tain novel features of construction, operation and arrangement of parts, an example of which is given in this specification and illustrated in the accompanying drawings, wherein f Figure 1 shows a vertical sectional view of the drill.

Figure 2 shows a cross sectional view taken on the line 22 of Figure 1.

Figure 3 shows a fragmentary vertical sectional view taken at right angles to the view shown in Figure 1, and

Figure 4 shows a bottom end view, thereof drawings wherein like numerals of reference designate similar parts in each of the figures, thhe numeral 1 designates the drill head, adapted to be connected to the lower end of the drill stem 2 by the 'drill collar 3. This head has a central bore 4 for the reception of the core barrel 6, formed of sections connected by the coupling 5 which rests on the upper end of the head 1. A tubular anchor 29 is fitted into the lower end of the bore 4 and secured to the lower end of the barrel 6. This anchor has diverging spindles 30, on which the cutting Feferring now more particularly the The lower end of the head has a plurality, preferably four, of dovetailed side rooves 9 to receive the respective anchors 10, 10 which are fitted upwardly therein and secured in place by the set screws 11. These anchors are further secured in place bymeans of a clamp collar 12 which is fitted down over the head and screwed thereon with its lower end abutting the external annular shoulder 13 on said head and anchors. The anchors above said shoulder 13,

are externally threaded to receive said clamp collar which houses said set screws 11 and whose upper end has an internal annular.

this invention has particular relation to cer- (outer ends of these rollers bear against washers, as 20, which are fitted over said bearings and are interposed between the outer ends of the rollers and the corresponding anchors 10. The outer ends of the busliings 17 are reduced, forming an annular bearing in which the rings 21, screwed into the outer ends of the rollers 19, run said rings retaining the rollers on their respective bearings. The rollers 19, run on the roller bearings 22, of conventional form, which are interposed between the rollers and their respective bearin s.

The cutting rollers 18 and 19 are preferably frusto-conical in form and arranged reversely with respect to each other. Each has side teeth'25 which operate on the bottom of the bore, and therollers 19 have inner end teeth 26 which form the core'at the bottom of the bore. I 4 5 The lower end of the head is formed "with pockets 27 in which these cutting rollers Tun, thus exposing only the lower sides of said rollers and between said pockets the head has the vertical water courses 28 leading down from within the drill stem and provided to supply flushing fluid to the cutters. 1

. In assembling this drill the cutting rollers 18 are first assembled with their respective anchors 10' and 29 and the lower barrel section is then attached to the anchor 29, and

as thus assembled the lower section is inserted up into the central-bore of the head and the anchor 10' fitted up into the corre: sponding groove 9, until the annular shoulder 31, of the anchor 29 abuts the lower end of the head and the collar is then screwed onto the lower barrel section 'until it abuts the upper end of the head. The anchors 10 with the cuttin rollers 18 assembled thereon' are inserted 1nto the other grooves .9 and the set bolts 11 are then inserted and the clamp collar 12 is screwed in place. The stem 1 and core barrel 6- are then attached and the drill is ready for operation. It should be mentioned that the upper end of this core barrel is controlled by an upwardly opening valve of conventional construction toprevent the flushing fluid from entering said barrel from above and washing out the core therein, and it is to be further noted that the inside of said lower barrel sectionis upwardly flared to permit the core to freely enter it.

What I claim is 1. A drill including a head having a central bore, detachable side anchors carried by the lower end thereof, a tubular anchor fitted into the lower end of said bore and secured therein, diverging spindles carried 12g said central anchor and. whose outer en are supported by the corresponding side anchors, inwardly projecting spindles carried by the other side anchors, cutting rollers mounted on said spindles and having their inner ends spaced apart.

2. A drill including a head having a central bore, detachable side anchors carried by the lower end thereof, a tubular anchor fitted into the lower end of said bore and secured therein, diverging spindles carried by said central anchor and whose, outer ends are supported by-thecorresponding side anchors, inwardly projecting spindles carried by-the other side anchors, cutting rollers mounted on said spindles and having their inner ends spaced apart, theinner ends and sides of said rollers having cutting teeth.

3. A drill including a head having a central bore detachable side anchors carried by the lower end thereof, a tubular anchor fitted into the. lower end of said bore and secured therein, diverging spindles carried by saidcentral anchor, and whose outer ends are supported by the corresponding side anchors, inwardly projecting spindles carried by the other side anchors, cutting rollers mounted on said spindles and having their inner ends spaced apart, the inner, ends and sides of said rollers having cutting teeth, and a core barrel attached to the head in ali nment with said bore.

n testimony whereof I have signed my name to this s ecification.

GR VILLE A. HUMASON. 

